*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    font-family: "微软雅黑";
}
.container{
    width:1130px;
    margin: auto;
}
.container::after{
    content: "";
    display: table;
    clear: both;
}
nav{
    background: #000;
}
nav ul::after{
    content: "";
    display: table;
    clear: both;
}
nav li{
    float: left;
    list-style: none;
}
nav ul .a{
    display: none;
}

nav a{
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    padding: 24px 20px;
    display: block;
}
nav a:hover{
    background: #fff;
    color: #000;
}
nav .active a{
    background: #fff;
    color: #000;
}
.banner{
    background: #2ba3d4;
    text-align: center;
    padding-top: 130px;
    padding-bottom: 130px;
    color: #ffffff;
}
.banner img{
    margin-bottom: 30px;
}
.banner p{
    margin-bottom: 30px;
}
.banner a{
    color: #2ba3d4;
    padding:18px 28px;
    background: #ffffff;
    display: inline-block;
    text-decoration: none;
    border-radius: 3px;
    border:1px solid #ffffff;
}
.banner a:hover{
    background: #2ba3d4;
    color: #ffffff;
}
.become{
    padding-top:150px;
    padding-bottom: 150px;
    text-align: center;
}
.become h2{
    font-size: 42px;
    margin-bottom: 50px;
    font-weight: 300;
}
.become h3{
    font-size: 20px;
    padding: 10px 0px;
}
.row{
    margin-left: -15px;
    margin-right: -15px;
}
.col-4{
    width: 33.333333%;
    float: left;
    padding: 15px;
}
.item{
    border:1px solid #e5e5e5;
    border-bottom-color: #0ba1d8;
    padding:30px;
    padding-bottom: 60px;
}
footer{
    background: #252525;
    padding-top: 50px;
    padding-bottom: 50px;
    text-align: center;
    color: #dddddd;
    font-size: 14px;
}
@media (max-width: 600px) {
    .container{
        width: 100%;
    }
    /*nav a{*/
        /*padding: 15px 15px;*/
    /*}*/
    .row{
        margin-left: 0;
        margin-right: 0;
    }
    .col-4{
        width:100%;
    }
    nav ul .a{
        display: block;
    }
    nav ul .a{
        float: right;
    }
    nav ul .active{
        display: block;
    }
    nav ul li{
        display: none;
    }

}




